StacksVerified U.S. regulatory reference

21 CFR §520.1855

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)Specifications. Each gram of paste contains 150 milligrams (mg) ponazuril.
  2. (b)Sponsor. See No. 000010 in § 510.600(c) of this chapter.
  3. (c)Conditions of use in horses—(1) Amount. Administer orally 15 mg per kilogram (kg) (6.81 mg per pound (lb)) body weight as the first dose, followed by 5 mg/kg (2.27 mg/lb) body weight once daily for a period of 27 additional days.
    1. (2)Indications for use. For the treatment of equine protozoal myeloencephalitis caused by Sarcocystis neurona.
    2. (3)Limitations. Do not use in horses intended for human consumption. Federal law restricts this drug to use by or on the order of a licensed veterinarian.